Facile synthesis, novel structure, multicolor luminescence, and potential applications of lanthanide ions doped bismuth titanate phosphors. Issue 12 (15th June 2023)

• Record Type: Journal Article
• Authors: Lou, Xiaomeng; Zhang, Cuimiao; Yu, Ziman; Yang, Yan; Zuo, Rumeng; Jia, Guang
• Is Part Of: Ceramics international. Volume 49:Issue 12(2023)
• Page Start: 20200
• Page End: 20209
• Publication Date: 2023-06-15
• Subjects: Bismuth titanate -- Pechini sol-gel route -- Multicolor emissions -- Luminescent mechanism -- LEDs and anti-counterfeiting applications; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2023.03.144
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A variety of lanthanide ions doped bismuth titanate (Bi4 Ti3 O12 ) luminescent materials with eminent down-conversion (DC) and up-conversion (UC) luminescence performance have been fabricated via a facile sol-gel approach. The XRD, XPS, and EDX elemental mapping results confirm the phase structure of orthorhombic Bi4 Ti3 O12 (BTO), and the lanthanide activator ions occupy the Bi 3+ lattice sites in the BTO crystal. Under UV or NIR excitation, the Eu 3+, Yb 3+ /Ln 3+ (Ln = Er, Tm, and Ho) doped Bi4 Ti3 O12 samples exhibit characteristic red, green, blue, and green emissions. The luminescent mechanisms of the BTO:Eu 3+ and BTO:Yb 3+ /Ln 3+ samples are discussed based on the energy level diagrams. The doping concentrations of Eu 3+, Yb 3+, Er 3+, Tm 3+, Ho 3+ ions and annealing temperature and time are optimized, whose optimal values are determined to be 14, 8, 1, 0.4, 1 mol% and 800 o C, 4 h. The as-obtained LED devices fabricated by Bi4 Ti3 O12 :Eu 3+ and Yb 3+ /Ln 3+ phosphors exhibit dazzling multicolor visible light emissions from different Ln 3+ ions. The results indicate that the as-obtained Ln 3+ doped BTO phosphors may be potentially utilized in LED devices and solid-state lighting. Furthermore, the Eu 3+ and Er 3+ co-doped BTO samples exhibit different DC and UC luminescence spectral profiles when excited at various UV, visible, or NIR wavelengths, revealing their eminent feasibility and great potential in anti-counterfeiting applications.